Writing instrument attachment



FIG. 1 is a perspective view of a writing instrument attachment in accordance with the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a left side view thereof, the right side view being a mirror image.

The broken lines showing the character “A” in the FIGS. illustrate portions of the writing instrument attachment that form no part of the claimed design. 

CLAIM The ornamental design for a writing instrument attachment, as shown and described. 